NK270 OPM/OPM&VFL series products use single chipmicroprocessorcontrol,CompleteFunctions。adoptembedded detector and laser, which can be well protect-ed.The machine has 10 standard wavelengths such as1270nm/1577nm, and also has frequency recognition,wavelength recognition, automatic shutdown, CW/1Hz/2Hzthree red light modes, backlight display, wavelengthmemory, user calibration, lighting and other func-tions.while supporting Support RJ45 cable sequence andline hunting test, wide test range, high accuracy.NK270mainly used for continuous optical signal powermeasurement, optical fiber link loss test and optical fiberline on-off test. They are widely used in optical cableconstruction and maintenance, optical fiber communica-tion, optical cable sensing, optical CATV and other fields.